>>67The water butt is good advice. As for soil, with carrots it's best to aim for a sandy loam, allows for faster growth. Organic soil mix depending on whether you are adding nutes. Keep it moist. You can either sow the seed close together or grow in tubes. Either way forces the carrot down.
If you are aiming for no fuss, grow radishes, they are fucking easy. Also oriental salads.
Depending on your grow season it difficult to suggest stuff. My two personal favs are chillis (limon & ring of fire - both short dtm) and the yin yang bean. That fucking bean is so cool.